Production of subject matter for blueprinting purposes



2 Sheets-Sheet .1

H. T. STORY PRODUCTION OF SUBJECT MATTER FOR BLUEPRINTING, PURPOSES Filed Feb. 10, 1947 May 30, 1950 H. T. STORY PRODUCTION OF SUBJECT-MATTER FOR BLUEPRINTING PURPOSES 2 Sheets-Sheet 2 w D 9 I B a L a z m- H- Il @5550 =2:

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Patented May 30, 1950 UNITED STATES PATENT OFFICE PRODUCTION OF SUBJECT MATTER FOR BLUEPRINTING PURPOSES 6 Claims.

This invention relates to the production of subject matter for blueprinting purposes and the like.

In the designing of architectural structures as well as structures for use in the mechanical arts, it is generally found that well known and standardized structures must be utilized, these oftentimes being used in more or less profusion. For instance, in the architectural field there are many windows present, the characteristics of which are generally similar as to sill and other structures. In such cases, the draftsman engaged in preparing the drawings is required to present details of such standard structure with considerable frequency, even in the same drawing, thus requiring much time and labor in applying such details, since the completed drawing, when blueprinted, should show these details wherever present to permit the examiner of the blueprint to obtain a clear picture of the subject matter being presented. The present invention is designed to mitigate these conditions as far as possible, without, however, affecting the blueprint showing.

It is the universal practice to :provide the designs upon paper of the light-ray transmission type--tracing paper, for instance-to permit the sheet containing the design to be readily blueprinted or given similar treatment. The present invention is designed to provide the design showing by practically segregating the design into separate portions and presents the parts having this similarity in showing on the rear face of the sheet instead of the front face and place the remaining parts of the design upon the front face of the sheet; when the sheet is blueprinted, the blueprint will present all of the parts in their co-related arrangement.

This segregation enables the use of other than drafting activities in the development of the subject matter, since it is possible to use printing, lithographing, engraving and the like as accessory to the usual drafting practices, due to the fact that since the standard formations are similar wherever used, and the use is with frequency both with the same design and in different designs, it is possible to prepare such standard formation showings under quantity conditions and thus be made available for use at any time; and to meet the needs of flexible positioning, etc., such showings are preferably applied to a separate sheet or sheets which can be applied to the rear face of the main sheet, such showings thus becoming serviceable as draftsmans aids; with the separate sheets formed of material which is of the lightray transmission type, it can be readily added to 2 r the main sheet without destroying the blueprinting possibilities.

The present invention, therefore, has for its objects a practice such as that indicated through the use of a particular method of preparing the sheet for the blueprinting regimen; a composite sheet of this type, and the draftsmans aid which enables the composite sheet to be produced by practicin the method, these thus forming a unitary invention. The advantage lies in the fact that the draftsmans aid showing may be as elaborate as desired so as to present the desired effect within the blueprint, and producing the de sired result with the draftsman being required to develop only the remainder of the subject matter on the face of the main sheet; since the added sheet is on the opposite side it presents no difficulty during the drafting; as the added sheet is of small dimensions, it can be positioned at any point, and, due to the nature of the material of both sheets, the draftsman is able to properly corelate his outlines with those of the portrayal on the added sheet, the portrayal being visible through both sheets.

To these and other ends, therefore, the nature of which will be better understood as the invention is hereinafter disclosed, said invention consists in the improved methods, combinations and constructions hereinafter more fully described, illustrated' in the accompanying drawings, and more particularly pointed out in the appended claims.

In the accompanying drawings, in which sim ilar reference characters indicate similar parts in each of the views? Figure 1 is a plan view of the separate sheet showing the design of an illustrative standard construction;

Figure 2 is a sectional view of the same, including the protecting sheet;

Figure 3 is a plan view of the front face of the cable for use in other fields such as the mechanical arts, and the invention contemplates such use. For the purpose of illustrating the invention and its characteristics, the same is shown in connection with its use in the architectural field.

Lay-outs for drawings of houses, etc., are generally elaborate as to details, drawn to scale, and show many d-iiier'en't views including many sections, etc. These are generally developed on tracing paper to form the originals, and the latter then blueprinted, as necessary, for use in examining and studying the design and during building construction; the originals are generally stored away and accessible for blueprinting at any time.

Usually, in developing the lay-out, the draftsman is required to duplicate many showings, such as the details of window construction, door frame assemblies and the like, due to their frequency use in a house construction, and since some of these are similar as to structure and oftentimes as to 'dimensiiin's, and are generahy of a standard type as'to formation, etc., the duplication thereof within the design requires much toil and time, in order that the design will be complete in appearance when inspected-care must be taken in providing the duplication, s nc'e shoddy work (to save trme) can give the impression of variation from the standard, while "ab sence of details makes the blueprint unsatisfactory. The mitigation of this time-consurning toil is the-problem for which the present invention is a solution.

Because of the similarity in details of such standard formations, it is possible to provide duplicate copies thereof by the use of a cut, lithograph, photo engraving or the like, which, if fashioned to scale, could be applied to the sheet, since any desired number of duplications can be made with an assurance that all are alike. However, to attempt to do this upon the tracing itself is more or less impracticable, due to the necessity of placing the illustration upon the sheet under conditions where the dimensions of the sheets used may vary, and the particular positionof the illustrationon the sheet will depend upon the design; hence, due not only to the excessive cost of such procedure, but to the inability to predeten mine the position, such course would not miti gate the conditions. And practically the same re sult would be present in any attempt to supply the illustration bythe use of a rubber stamp, since it would be necessary to go over the 'l-ines' of the illustration to make it suitable for blueprinting purposes.

The present invention solves the problem by applying the illustration to a face of a'separate sheet of proper dimensions based-on the illustration itself rather than upon the complete design, and then adhesively applying the separate sheet to a facepreferably the rear i aceof the tracing paper sheet; with the separate sheet formed of paper or the like suitable for light-ray transmission, the composite sheet thus produced, with the residue of the design completed on the front face of the tracing paper sheet, can be readily blueprinted with the latter presenting the complete design as though the latter had been prepared by the draftsmans labor alone. Obviously, the separate sheet can beapplied in any desired position, and the separate sheet can be properly trimmed to a desired size to provide the proper appearance and the separate sheet with its .preformed illustrationdefinitely serves as a draftsmans aid, since it can be supplied in quantities, and one of the sheets be used whenever desired.

The drafting aid thus described may be of any preferred type and manufacture-in practice, I have used a material marketed under the name of Permafllm, with a dull finish and commercially obtainable in the open market, with the film as Du Pont cellulose acetate. One side of the sheet carries a non-rubber resinous adhesive with an odorless base, and requires neither heat nor moisture for its application to the tracing paper, being smoothed out and pressed into position; because of the nature of this adhesive, the coated face, when not in service, carries a suitable protective sheet covering which is stripped off when the sheet is to be applied.

While the illustration could be printed on either side of the separate sheet, it is preferred to place it-on the side opposite the adhesive, in which case the illustration is itself fashioned in reverse position in order that the blueprint will present the illustration with its proper appearance, it being understood that in such case, the illustration is actually on the bottom face of the composite sheet.

In the accompanying drawings, A indicates a sheet of tracing paper, with its front face carrying the portions of the subject matter of the design not disclosed on the separate sheet, and may be provided by pencil or ink 'such portions are indicated at a.

B indicates the separate sheet, on one side of whichpreferably the rear face l7--is applied the illustration of the standard portions of the subject matter design referred to above, as by print ing, lithographing, photo-engraving, or the like, such illustration being indicated at 1). One of the sides of thesheet-preferably the front sidecarries a coating of a resin adhesiveindicated at b2, with b3 indicating a protecting sheet which ove'l-ies the coating and which is stripped oh the coating when the sheet B is to be applied to the rear face of sheet A.

C represents the blueprinted sheet carrying the complete subject matter design; the view showing this sheet does not attempt to present it in its form of colored background with white lines, the view presenting the result with black lines on a white background.

The sheet B is of suiiicient dimensions to include all of the desired standard structure of the design; in practice the sheet dimensions can be uniform to permit ready printing, etc., and then trimmed down to meet the individual service;

-; during printing the protecting sheet 123 is preferably in position. Sheet 13 can be applied to sheet A before or after the portions a are applied to the front face of sheet A.

The subject matter of the design shown is illus- Lrative only and used to illustrate the manner of developing the invention. Obviously, if in the held of architecture, the actual Sheet A willcarry a complete view with as many of the illustrations of Sheet B as may be needed and properly applied. In the me'c'hanical arts, as in making working drawings for blueprinting purposes, a similar procedure is employed.

The advantages of the invention have been indicated above as making possible the presentation, in all its detail, of the structure which has this standarized characteristic, regardless of the number of times it is duplicated in the complete design, obtaining this result without the necessity of the draftsman painstakingly delineating the structure when developing the complete design obviously the labor and the time cost of preparing complete design is thus greatly reduced, without, however, detracting from the completeness of the showing of the design on the blueprint; since the separate sheet portions remain as a permanent part of the original tracing in storage, the tracing is always available to duplicate the blueprints, so that the development savings remain permanent, decreasing the cost of the original accordingly.

While I have herein disclosed the invention in a preferred form, it will be readily understood that changes and/or modifications therein may be found essential in meeting the exigencies of service or the individual desires of a user, as to the method, the composite sheet or the draftmans aid; I therefore reserve the right to make any and all such changes and/or modifications therein, as may be deemed essential or desirable, insofar as the same may fall within the spirit and scope of the invention, as expressed in the accompanying claims, when broadly construed.

What is claimed as new is:

1. In the production of subject matter for blueprinting purposes, wherein the subject matter is presented in the form of a composite portrayal carried by sheet material of a light-ray transmission type suitable for blueprinting purposes, and wherein the portrayal ensemble includes a portion portraying a standard formation included relative to delineated portions individual to the particular subject matter to be portrayed by the blueprint, the method of producing the sheet material portrayal which consists in presenting the preformed standard formation upon a sheet portion of light-ray transmission type and having an adhesive-equipped face, mounting such sheet portion upon the rear face of the main sheet material, and thereafter applying the individual delineated remaining portions of the subject matter to the front face of such main sheet material whereby the separate portrayals will be correlated into a complete composite portrayal of the subject matter upon the blueprint product when the composite sheet is subjected to the blueprinting regimen.

2. A method as in claim 1 characterized in that the sheet portion bearing the portrayal of the standard formation is applied to the rear face of the main sheet with such design portrayal presented on the rear face of the composite sheet and with the design presented as a reversal of the standard formation structure to thereby cause the blueprinted form of the subject matter to present the complete subject matter in its normal relationship.

3. A sheet ensemble for service as a subject matter source for blueprinting service, said sheet ensemble comprising a transparent main sheet, and an applied transparent sheet portion adherently secured to the rear face of the main sheet, said sheet portion carrying the preformed portrayal of a standard formation present as a part of the complete subject matter development, the front face of the main sheet carrying a portrayal of the residue of the subject matter with the standard formation omitted to thereby cause the several portrayals to be presented in correlated form on the blueprint when the composite sheet is subjected to a blueprinting regimen.

4. A sheet ensemble as in claim 3 characterized in that design of the standard formation carried by the sheet portion of the ensemble has the design exposed on the rear face of the ensemble with the design presented as a reversal of the standard formation, whereby the light ray transmission between the planes of the portrayals extends through both sheets of the ensemble between such planes.

5. As a drafting aid in producing subject matter designed for reproduction by blueprinting, wherein the subject matter for blueprinting is carried by a main transparent sheet, and wherein the subject matter includes a structural presentation of standard construction, such aid comprising a transparent sheet portion separate from and of smaller dimensions than the main sheet with such sheet portion, said sheet portion bearing an applied presentation of such subject matter portion of standard construction, said sheet portion additionally having one of its faces carrying a coating of resinous type capable of adherently connecting the sheet portion to the rear face of the main sheet with the applied presentation visible through the main sheet to thereby permit completion of the remainder of the complete subject matter on the front face of the main sheet and to permit presentation of the complete subject matter on the blueprint when the composite sheet is subjected to a blueprinting regimen.

6. An aid as in claim 5 characterized in that the design of the standard construction portrayed 0n the sheet portion is carried by the sheet face opposite that bearing the resinous coating with the applied design presented as a reversal of the standard structure to thereby cause the blueprinted form of the subject matter to present the standard structure within and in normal relationship to the complete subject matter.

HOWARD T. STORY.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,781,313 Blau Nov. 11, 1930 2,143,141 Cooley Jan. 10, 1939 2,200,203 Heintz May '7, 1940 

